Collect and Build Robo-Smash in the Robo-Creatures Series – motorized for exciting mechanical movement! Includes 156 K’nex parts, primarily rods and connectors. The motor allows for unique and exciting mechanical movement. Robo-Strike hops along just like a primate! And that’s not all – combine all three sets in the Robo-Creatures series to create the ultimate creature! Recommended for builders ages 7+. All sets require 2 “aa” batteries, not included. Gender: Unisex.